Two elements $$'P'$$ and $$'Q'$$ combine to form a compound. Atomic mass of $$'P'$$ is 12 and $$'Q'$$ is 16. Percentage of $$'P'$$ in the compound is 27.3. What will be the empirical formula of the compound ?
A.
$${P_2}{Q_2}$$
B.
$$PQ$$
C.
$${P_2}Q$$
D.
$$P{Q_2}$$
Answer :
$$P{Q_2}$$
Solution :
Element
%
No. of moles
Molar ratio
Whole no. ratio
$$P$$
27.3
$$\frac{{27.3}}{{12}} = 2.27$$
1
1
$$Q$$
72.7
$$\frac{{72.7}}{{16}} = 4.54$$
2
2
Empirical formula $$ = P{Q_2}$$
Releted MCQ Question on Physical Chemistry >> Some Basic Concepts in Chemistry
Releted Question 1
$$27 g$$ of $$Al$$ will react completely with how many grams of oxygen?